X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fbinfmt_flat.c;h=fcb3405bb14e99b64aa322f7e3856ee3fa2ddbb1;hb=e9bd2b3bafd29bf75522546207f0bba0ec4515c2;hp=ae8595d498569a72c6be2f4ce45d956326d33a9a;hpb=b361735043e3001eadb1d40916fd1a4fca1a9363;p=linux-2.6

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index ae8595d498..fcb3405bb1 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -419,7 +419,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 	unsigned long textpos = 0, datapos = 0, result;
 	unsigned long realdatastart = 0;
 	unsigned long text_len, data_len, bss_len, stack_len, flags;
-	unsigned long memp = 0; /* for finding the brk area */
+	unsigned long len, reallen, memp = 0;
 	unsigned long extra, rlim;
 	unsigned long *reloc = 0, *rp;
 	struct inode *inode;
@@ -540,17 +540,25 @@ static int load_flat_file(struct linux_binprm * bprm,
 			goto err;
 		}
 
+		len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
 		down_write(&current->mm->mmap_sem);
-		realdatastart = do_mmap(0, 0, data_len + extra +
-				MAX_SHARED_LIBS * sizeof(unsigned long),
-				PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
+		realdatastart = do_mmap(0, 0, len,
+			PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
+		/* Remap to use all availabe slack region space */
+		if (realdatastart && (realdatastart < (unsigned long)-4096)) {
+			reallen = ksize(realdatastart);
+			if (reallen > len) {
+				realdatastart = do_mremap(realdatastart, len,
+					reallen, MREMAP_FIXED, realdatastart);
+			}
+		}
 		up_write(&current->mm->mmap_sem);
 
 		if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
 			if (!realdatastart)
 				realdatastart = (unsigned long) -ENOMEM;
 			printk("Unable to allocate RAM for process data, errno %d\n",
-					(int)-datapos);
+					(int)-realdatastart);
 			do_munmap(current->mm, textpos, text_len);
 			ret = realdatastart;
 			goto err;
@@ -584,11 +592,20 @@ static int load_flat_file(struct linux_binprm * bprm,
 
 	} else {
 
+		len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
 		down_write(&current->mm->mmap_sem);
-		textpos = do_mmap(0, 0, text_len + data_len + extra +
-					MAX_SHARED_LIBS * sizeof(unsigned long),
-				PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
+		textpos = do_mmap(0, 0, len,
+			PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
+		/* Remap to use all availabe slack region space */
+		if (textpos && (textpos < (unsigned long) -4096)) {
+			reallen = ksize(textpos);
+			if (reallen > len) {
+				textpos = do_mremap(textpos, len, reallen,
+					MREMAP_FIXED, textpos);
+			}
+		}
 		up_write(&current->mm->mmap_sem);
+
 		if (!textpos  || textpos >= (unsigned long) -4096) {
 			if (!textpos)
 				textpos = (unsigned long) -ENOMEM;
@@ -725,6 +742,7 @@ static int load_flat_file(struct linux_binprm * bprm,
 	 * __start to address 4 so that is okay).
 	 */
 	if (rev > OLD_FLAT_VERSION) {
+		unsigned long persistent = 0;
 		for (i=0; i < relocs; i++) {
 			unsigned long addr, relval;
 
@@ -732,6 +750,8 @@ static int load_flat_file(struct linux_binprm * bprm,
 			   relocated (of course, the address has to be
 			   relocated first).  */
 			relval = ntohl(reloc[i]);
+			if (flat_set_persistent (relval, &persistent))
+				continue;
 			addr = flat_get_relocate_addr(relval);
 			rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
 			if (rp == (unsigned long *)RELOC_FAILED) {
@@ -740,7 +760,8 @@ static int load_flat_file(struct linux_binprm * bprm,
 			}
 
 			/* Get the pointer's value.  */
-			addr = flat_get_addr_from_rp(rp, relval, flags);
+			addr = flat_get_addr_from_rp(rp, relval, flags,
+							&persistent);
 			if (addr != 0) {
 				/*
 				 * Do the relocation.  PIC relocs in the data section are